1243452985 has 4 divisors (see below), whose sum is σ = 1492143588. Its totient is φ = 994762384.

The previous prime is 1243452983. The next prime is 1243453007. The reversal of 1243452985 is 5892543421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 475719721 + 767733264 = 21811^2 + 27708^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243452985 - 2¹ = 1243452983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243452983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124345294 + ... + 124345303.

It is an arithmetic number, because the mean of its divisors is an integer number (373035897).

Almost surely, 2^1243452985 is an apocalyptic number.

It is an amenable number.

1243452985 is a deficient number, since it is larger than the sum of its proper divisors (248690603).

1243452985 is an equidigital number, since it uses as much as digits as its factorization.

1243452985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248690602.

The product of its digits is 345600, while the sum is 43.

The square root of 1243452985 is about 35262.6287307115. The cubic root of 1243452985 is about 1075.3333698363. Note that the first 4 decimals are identical.

The spelling of 1243452985 in words is "one billion, two hundred forty-three million, four hundred fifty-two thousand, nine hundred eighty-five".